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OPA698: The output voltage falls slowly in the simulator

Part Number: OPA698

I want to use the OPA698 PSPICE model on a simulator.
The simulator used is Keysight's ADS.

①If you set the gain to 2 times, the desired amplitude will be obtained.
However, the fall timing and the time it takes to fall are delayed.
Why is this?

②When the gain is set to 2 times or more, the amplitude does not change from the limit (1.8V).

Why is this?